Patch merged into coreboot/master: d58ba2a add gpio.h for generic GPIO-related definitions

the following patch was just integrated into master:
commit d58ba2add4b0ae955126ca746db39aa9fa98fd9f
Author: David Hendricks 
Date:   Sat Feb 2 16:57:11 2013 -0800

add gpio.h for generic GPIO-related definitions

This adds /src/include/gpio.h which currently contains generic GPIO
    enums for type (in/out/alt) and 3-state logic.

The header was originally written for another FOSS project
    (code.google.com/p/mosys) and thus the BSD license.

Change-Id: Id1dff69169e8b1ec372107737d356b0fa0d80498
    Signed-off-by: David Hendricks 
    Reviewed-on: http://review.coreboot.org/2265
    Tested-by: build bot (Jenkins)
    Reviewed-by: Ronald G. Minnich

Build-Tested: build bot (Jenkins) at Mon Feb  4 05:32:34 2013, giving +1
Reviewed-By: Ronald G. Minnich  at Mon Feb  4 05:38:32 2013, giving +2
See http://review.coreboot.org/2265 for details.

-gerrit